class PyBytes(object):
    """
    1\bytes(iterable_of_ints) -> bytes
    由可迭代对象创建 bytes(range(20))

    2\bytes(string, encoding[, errors]) -> bytes


    3\bytes(bytes_or_buffer) -> bytes
    通过二进制buff创建bytes对象 bytes(obj)

    4\bytes(int) -> bytes
    指定长度的以零值填充的 bytes 对象: bytes(10)

    5\bytes() -> empty bytes object
    指定空长度返回一个空的bytes对象

    Construct an immutable array of bytes from:
      - an iterable yielding integers in range(256)
      - a text string encoded using the specified encoding
      - any object implementing the buffer API.
      - an integer
    # (copied from class doc)
    """
    def __init__(self):
        self.container = [
        ]

